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Go patch committed: Fix shift type determination

From: Ian Lance Taylor <iant at golang dot org>
To: gcc-patches <gcc-patches at gcc dot gnu dot org>, "gofrontend-dev at googlegroups dot com" <gofrontend-dev at googlegroups dot com>
Date: Wed, 9 Aug 2017 14:24:21 -0700
Subject: Go patch committed: Fix shift type determination
Authentication-results: sourceware.org; auth=none

In Go it's possible to construct an lshift expression using
unsafe.Sizeof that is technically a compile-time constant but can't be
evaluated without going through backend methods.  This patch by Than
McIntosh ensures that in this case Type::make_non_abstract_type is
called on the numeric operand of the shift (as opposed to leaving as
abstract), to avoid an assert later on in the compiler flow.  This
fixes https://golang.org/issue/21372.  Bootstrapped and ran Go
testsuite on x86_64-pc-linux-gnu.  Committed to mainline.

Ian

Attachment: patch.txt
Description: Text document

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